/*
 * Copyright 2019-2020 by Nedim Sabic Sabic
 * https://www.fibratus.io
 * All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ql

import "fmt"

// Node represents a node in the abstract syntax tree.
type Node interface {
	String() string
}

// Expr represents an expression that can be evaluated to a value.
type Expr interface {
	Node
}

// ParenExpr represents a parenthesized expression.
type ParenExpr struct {
	Expr Expr
}

// String returns a string representation of the parenthesized expression.
func (e *ParenExpr) String() string { return fmt.Sprintf("(%s)", e.Expr.String()) }

// BinaryExpr represents an operation between two expressions.
type BinaryExpr struct {
	Op  token
	LHS Expr
	RHS Expr
}

// String returns a string representation of the binary expression.
func (e *BinaryExpr) String() string {
	return fmt.Sprintf("%s %s %s", e.LHS.String(), e.Op.String(), e.RHS.String())
}
